Department of Microbiology and Biomonitoring, Faculty of Agriculture and Economics, University of Agriculture in Krakow, 31-120 Krakow, Poland.
Department of Rural Building, Faculty of Environmental Engineering and Land Surveying, University of Agriculture in Krakow, 31-120 Krakow, Poland.
Int J Environ Res Public Health. 2022 Oct 29;19(21):14124. doi: 10.3390/ijerph192114124.
COD is an arbitrary indicator of the content of organic and inorganic compounds in wastewater. The aim of this research was to determine the effect of COD of industrial wastewater on the nitrification process. This research covered wastewater from acrylonitrile and styrene-butadiene rubbers, emulsifiers, polyvinyl acetate, styrene, solvents (butyl acetate, ethyl acetate) and owipian (self-extinguishing polystyrene intended for expansion) production. The volume of the analyzed wastewater reflected the active sludge load in the real biological treatment system. This research was carried out by the method of short-term tests. The nitrification process was inhibited to the greatest extent by wastewater from the production of acrylonitrile (approx. 51%) and styrene-butadiene (approx. 60%) rubbers. In these wastewaters, nitrification inhibition occurred due to the high COD load and the presence of inhibitors. Four-fold dilution of the samples resulted in a two-fold reduction in the inhibition of nitrification. On the other hand, in the wastewater from the production of emulsifiers and polyvinyl acetate, a two-fold reduction in COD (to the values of 226.4 mgO·dm and 329.8 mgO·dm, respectively) resulted in a significant decrease in nitrification inhibition. Wastewater from the production of styrene, solvents (butyl acetate, ethyl acetate) and owipian inhibited nitrification under the influence of strong inhibitors. Lowering the COD value of these wastewaters did not significantly reduce the inhibition of nitrification.
COD 是废水中有机和无机化合物含量的任意指标。本研究旨在确定工业废水中 COD 对硝化过程的影响。本研究涵盖了丙烯腈和丁苯橡胶、乳化剂、聚醋酸乙烯酯、苯乙烯、溶剂（醋酸丁酯、醋酸乙酯）和 owipian（用于膨胀的自熄聚苯乙烯）生产过程中的废水。分析废水的体积反映了实际生物处理系统中的活性污泥负荷。本研究采用短期测试法进行。丙烯腈（约 51%）和丁苯橡胶（约 60%）生产废水对硝化过程的抑制作用最大。在这些废水中，硝化抑制是由于高 COD 负荷和抑制剂的存在造成的。样品的四倍稀释导致硝化抑制作用降低了两倍。另一方面，在乳化剂和聚醋酸乙烯酯生产废水的 COD 降低两倍（分别降低至 226.4 mgO·dm 和 329.8 mgO·dm）后，硝化抑制作用显著降低。苯乙烯、溶剂（醋酸丁酯、醋酸乙酯）和 owipian 生产废水在强抑制剂的影响下抑制硝化作用。降低这些废水的 COD 值并不能显著降低硝化抑制作用。
